Lucent Technologies CAJUN M770, User Manual

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Cajun M770 ATM Switch User’s Guide 179
Chapter 16
Managing an ELAN
This chapter describes how to use the command-line interface to manage an ELAN
in a Cajun M770 ATM Switch.
For information about how to access and use the Cajun M770 ATM Switch
command-line interface, see Chapter 3, How to Use the Command-line Interface.
ELAN Database Maintenance
You can create and maintain an ELAN database on any switch that is hosting a
resilient LECS. Switches that are hosting resilient LECSes, do not carry out any
checking of database consistency. It is up to you to create and maintain the same
LANE services information on all switches that could host the “active LECS”. This
will ensure that a resilient LECS can smoothly take over the running of the
network, should the active elected LECS fail.
Note: Until you have configured a switch hosting a resilient LECS, with the same
LANE services information as the active LECS, it may be prudent to set the resilient
LECS priority to zero.
This would ensure that the resilient LECS could not be elected as the “active LECS”.
For more information about managing the resilient LECS, see Proprietary resilient
LECS in Chapter 13, LANE Services.
Viewing Default ELANs
When a LEC contacts the LECS, it usually specifies the ELAN name or the ELAN
type that it wants to join. The LECS in an M770 ATM Switch will enable you to
define up to 64 different ELAN names. You can also define default ELANs that the
LEC should join, should it only specify the ELAN type.
However, in some cases the LEC may neither specify an ELAN name nor the ELAN
type that it wishes to join. For these cases, you can set a default ELAN that will be
used.
The following default ELAN types can be specified in the LECS. The default settings
in an M770 ATM Switch are also provided:
• Ethernet type ELAN - A default ELAN name of “default” is specified in an
M770 ATM Switch M770 for this ELAN type.
• Unspecified type ELAN - A default ELAN name of “default” will be used when
the LEC provides neither an ELAN name nor a specific ELAN type that it wants
to join.